/in/foo.cc: In function 'int main()':
/in/foo.cc:5:9: error: 'cin' was not declared in this scope
    5 |         cin >> n;
      |         ^~~
/in/foo.cc:9:9: error: 'cout' was not declared in this scope
    9 |         cout << end << endl;
      |         ^~~~
/in/foo.cc:9:24: error: 'endl' was not declared in this scope; did you mean 'end'?
    9 |         cout << end << endl;
      |                        ^~~~
      |                        end
/in/foo.cc:10:9: error: 'system' was not declared in this scope
   10 |         system("pause");
      |         ^~~~~~